1. Naval Air Warfare Center, Weapons Division, Research Department, Chemistry Division, US Navy, China Lake, California 93555, United States
2. Department of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States
3. Department of Chemistry, University of California, Davis, Davis, California 95616, United States
4. Department of Chemistry, The University of Manchester, Manchester M13 9PL, U.K.
5. Department of Chemical and Biomolecular Engineering, University of California, Berkeley, Berkeley, California 94720, United States
6. Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States